Abstract
Excited state relaxation in Tb3+ in POCl3:SnCl4 aprotic solvent has been examined. It is found that at a concentration of 10−1 M Tb3+, the fluorescence exclusively originates from the5D4 level. The appreciable increase in the decay times of Tb3+ in this solvent compared to its values in H2O or D2O, suggests that the decrease in non-radiative relaxations is due to the low energy vibrations characteristic of this solvent. Non-radiative transfer of energy from Tb3+ → Nd3+ and from Tb3+ → Ho3+ in this solvent has been established by examining the lifetime data. Calculated values of energy transfer probabilities (Pda) in the liquid air temperature are analysed to obtain a clue regarding the nature of excitation transfer mechanism. In both the systems, the energy transfer from Tb3+ donors to Nd3+ as well as Ho3+ acceptors, occurs predominantly via a dipole-dipole process. At high temperature the energy transfer is increased.
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